Add Loader argument to 'yaml.load' invocations as required by PyYAML 6.0.

Submitted upstream:

  https://github.com/ganeti/ganeti/pull/1668

diff --git a/qa/qa_utils.py b/qa/qa_utils.py
index da485df48..27428e685 100644
--- a/qa/qa_utils.py
+++ b/qa/qa_utils.py
@@ -450,7 +450,7 @@ def GetObjectInfo(infocmd):
   master = qa_config.GetMasterNode()
   cmdline = utils.ShellQuoteArgs(infocmd)
   info_out = GetCommandOutput(master.primary, cmdline)
-  return yaml.load(info_out)
+  return yaml.load(info_out, Loader=yaml.SafeLoader)
 
 
 def UploadFile(node, src):
diff --git a/test/py/ganeti.cli_unittest.py b/test/py/ganeti.cli_unittest.py
index 9cc980afa..242aac9fd 100755
--- a/test/py/ganeti.cli_unittest.py
+++ b/test/py/ganeti.cli_unittest.py
@@ -1141,14 +1141,15 @@ class TestFormatPolicyInfo(unittest.TestCase):
           self._RenameDictItem(minmax, key, keyparts[0])
     self.assertTrue(constants.IPOLICY_DTS in parsed)
     parsed[constants.IPOLICY_DTS] = yaml.load("[%s]" %
-                                              parsed[constants.IPOLICY_DTS])
+                                              parsed[constants.IPOLICY_DTS],
+                                              Loader=yaml.SafeLoader)
 
   @staticmethod
   def _PrintAndParsePolicy(custom, effective, iscluster):
     formatted = cli.FormatPolicyInfo(custom, effective, iscluster)
     buf = StringIO()
     cli._SerializeGenericInfo(buf, formatted, 0)
-    return yaml.load(buf.getvalue())
+    return yaml.load(buf.getvalue(), Loader=yaml.SafeLoader)
 
   def _PrintAndCheckParsed(self, policy):
     parsed = self._PrintAndParsePolicy(policy, NotImplemented, True)
token.scm'>
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<option value='grep'>log msg</option>
<option value='author'>author</option>
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</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=41cf573f0a4fefb0539174b46cfe65e9db128870'>root</a>/<a href='/guix/log/gnu?id=41cf573f0a4fefb0539174b46cfe65e9db128870'>gnu</a>/<a href='/guix/log/gnu/tests?id=41cf573f0a4fefb0539174b46cfe65e9db128870'>tests</a>/<a href='/guix/log/gnu/tests/security-token.scm?id=41cf573f0a4fefb0539174b46cfe65e9db128870'>security-token.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/tests/security-token.scm?id=41cf573f0a4fefb0539174b46cfe65e9db128870&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-09-26 23:20:56 +0200'>2021-09-26</span></td><td><a href='/guix/commit/gnu/tests/security-token.scm?id=89b05442933d92f4b21c3294455a498e8333727d'>tests: Reduce boilerplate for users of 'system-test-runner'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/tests/audio.scm, gnu/tests/base.scm, gnu/tests/ci.scm,
gnu/tests/cups.scm, gnu/tests/databases.scm, gnu/tests/desktop.scm,
gnu/tests/dict.scm, gnu/tests/docker.scm, gnu/tests/file-sharing.scm,
gnu/tests/ganeti.scm, gnu/tests/guix.scm, gnu/tests/ldap.scm,
gnu/tests/linux-modules.scm,
gnu/tests/mail.scm, gnu/tests/messaging.scm, gnu/tests/monitoring.scm,
gnu/tests/networking.scm, gnu/tests/nfs.scm,
gnu/tests/package-management.scm, gnu/tests/reconfigure.scm,
gnu/tests/rsync.scm, gnu/tests/security-token.scm,
gnu/tests/singularity.scm, gnu/tests/ssh.scm, gnu/tests/telephony.scm,
gnu/tests/version-control.scm, gnu/tests/virtualization.scm,
gnu/tests/web.scm: Remove (mkdir #$output) (chdir #$output) and
pass #$output as argument to 'system-test-runner'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-09-25 18:52:05 +0200'>2021-09-25</span></td><td><a href='/guix/commit/gnu/tests/security-token.scm?id=1fb75128a5202b406622da6272bc809c46d1f439'>tests: Adjust to SRFI-64 as found in Guile 3.0.7.</a><span class='msg-avail'>...<span class='msg-tooltip'>In Guile 3.0.7, 'test-runner-current' is set to #f upon 'test-end'.
Consequently, the previous strategy, where we'd call
'test-runner-current' after 'test-end', no longer works.  Instead, set
the test runner in each test right before 'test-begin'.

* gnu/build/marionette.scm (system-test-runner): New procedure.
* gnu/tests/audio.scm (run-mpd-test): Replace (exit (= ...)) idiom
by (test-runner-current (system-test-runner)).
* gnu/tests/base.scm (run-basic-test)
(run-cleanup-test, run-mcron-test, run-nss-mdns-test): Likewise.
* gnu/tests/ci.scm (run-laminar-test): Likewise.
* gnu/tests/cups.scm (run-cups-test): Likewise.
* gnu/tests/databases.scm (run-memcached-test)
(run-postgresql-test, run-mysql-test): Likewise.
* gnu/tests/desktop.scm (run-elogind-test): Likewise.
* gnu/tests/dict.scm (run-dicod-test): Likewise.
* gnu/tests/docker.scm (run-docker-test): Likewise.
(run-docker-system-test): Likewise.
* gnu/tests/file-sharing.scm (run-transmission-daemon-test): Likewise.
* gnu/tests/ganeti.scm (run-ganeti-test): Likewise.
* gnu/tests/guix.scm (run-guix-build-coordinator-test): Likewise.
(run-guix-data-service-test): Likewise.
* gnu/tests/ldap.scm (run-ldap-test): Likewise.
* gnu/tests/linux-modules.scm (run-loadable-kernel-modules-test-base): Likewise.
* gnu/tests/mail.scm (run-opensmtpd-test)
(run-exim-test, run-dovecot-test, run-getmail-test): Likewise.
* gnu/tests/messaging.scm (run-xmpp-test)
(run-bitlbee-test, run-quassel-test): Likewise.
* gnu/tests/monitoring.scm (run-prometheus-node-exporter-server-test)
(run-zabbix-server-test): Likewise.
* gnu/tests/networking.scm (run-inetd-test, run-openvswitch-test)
(run-dhcpd-test, run-tor-test, run-iptables-test, run-ipfs-test): Likewise.
* gnu/tests/nfs.scm (run-nfs-test)
(run-nfs-server-test, run-nfs-root-fs-test): Likewise.
* gnu/tests/package-management.scm (run-nix-test): Likewise.
* gnu/tests/reconfigure.scm (run-switch-to-system-test)
(run-upgrade-services-test, run-install-bootloader-test): Likewise.
* gnu/tests/rsync.scm (run-rsync-test): Likewise.
* gnu/tests/security-token.scm (run-pcscd-test): Likewise.
* gnu/tests/singularity.scm (run-singularity-test): Likewise.
* gnu/tests/ssh.scm (run-ssh-test): Likewise.
* gnu/tests/telephony.scm (run-jami-test): Likewise.
* gnu/tests/version-control.scm (run-cgit-test): Likewise.
(run-git-http-test, run-gitolite-test, run-gitile-test): Likewise.
* gnu/tests/virtualization.scm (run-libvirt-test, run-childhurd-test): Likewise.
* gnu/tests/web.scm (run-webserver-test, run-php-fpm-test)
(run-hpcguix-web-server-test, run-tailon-test, run-patchwork-test): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>